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1/*
2 * AGPGART driver.
3 * Copyright (C) 2004 Silicon Graphics, Inc.
4 * Copyright (C) 2002-2005 Dave Jones.
5 * Copyright (C) 1999 Jeff Hartmann.
6 * Copyright (C) 1999 Precision Insight, Inc.
7 * Copyright (C) 1999 Xi Graphics, Inc.
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be included
17 * in all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * JEFF HARTMANN, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM,
23 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
24 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
25 * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 *
27 * TODO:
28 * - Allocate more than order 0 pages to avoid too much linear map splitting.
29 */
30#include <linux/module.h>
31#include <linux/pci.h>
32#include <linux/pagemap.h>
33#include <linux/miscdevice.h>
34#include <linux/pm.h>
35#include <linux/agp_backend.h>
36#include <linux/vmalloc.h>
37#include <linux/dma-mapping.h>
38#include <linux/mm.h>
39#include <linux/sched.h>
40#include <linux/slab.h>
41#include <asm/io.h>
42#ifdef CONFIG_X86
43#include <asm/set_memory.h>
44#endif
45#include "agp.h"
46
47__u32 *agp_gatt_table;
48int agp_memory_reserved;
49
50/*
51 * Needed by the Nforce GART driver for the time being. Would be
52 * nice to do this some other way instead of needing this export.
53 */
54EXPORT_SYMBOL_GPL(agp_memory_reserved);
55
56/*
57 * Generic routines for handling agp_memory structures -
58 * They use the basic page allocation routines to do the brunt of the work.
59 */
60
61void agp_free_key(int key)
62{
63 if (key < 0)
64 return;
65
66 if (key < MAXKEY)
67 clear_bit(key, agp_bridge->key_list);
68}
69EXPORT_SYMBOL(agp_free_key);
70
71
72static int agp_get_key(void)
73{
74 int bit;
75
76 bit = find_first_zero_bit(agp_bridge->key_list, MAXKEY);
77 if (bit < MAXKEY) {
78 set_bit(bit, agp_bridge->key_list);
79 return bit;
80 }
81 return -1;
82}
83
84/*
85 * Use kmalloc if possible for the page list. Otherwise fall back to
86 * vmalloc. This speeds things up and also saves memory for small AGP
87 * regions.
88 */
89
90void agp_alloc_page_array(size_t size, struct agp_memory *mem)
91{
92 mem->pages = kvmalloc(size, GFP_KERNEL);
93}
94EXPORT_SYMBOL(agp_alloc_page_array);
95
96static struct agp_memory *agp_create_user_memory(unsigned long num_agp_pages)
97{
98 struct agp_memory *new;
99 unsigned long alloc_size = num_agp_pages*sizeof(struct page *);
100
101 if (INT_MAX/sizeof(struct page *) < num_agp_pages)
102 return NULL;
103
104 new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
105 if (new == NULL)
106 return NULL;
107
108 new->key = agp_get_key();
109
110 if (new->key < 0) {
111 kfree(new);
112 return NULL;
113 }
114
115 agp_alloc_page_array(alloc_size, new);
116
117 if (new->pages == NULL) {
118 agp_free_key(new->key);
119 kfree(new);
120 return NULL;
121 }
122 new->num_scratch_pages = 0;
123 return new;
124}
125
126struct agp_memory *agp_create_memory(int scratch_pages)
127{
128 struct agp_memory *new;
129
130 new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
131 if (new == NULL)
132 return NULL;
133
134 new->key = agp_get_key();
135
136 if (new->key < 0) {
137 kfree(new);
138 return NULL;
139 }
140
141 agp_alloc_page_array(PAGE_SIZE * scratch_pages, new);
142
143 if (new->pages == NULL) {
144 agp_free_key(new->key);
145 kfree(new);
146 return NULL;
147 }
148 new->num_scratch_pages = scratch_pages;
149 new->type = AGP_NORMAL_MEMORY;
150 return new;
151}
152EXPORT_SYMBOL(agp_create_memory);
153
154/**
155 * agp_free_memory - free memory associated with an agp_memory pointer.
156 *
157 * @curr: agp_memory pointer to be freed.
158 *
159 * It is the only function that can be called when the backend is not owned
160 * by the caller. (So it can free memory on client death.)
161 */
162void agp_free_memory(struct agp_memory *curr)
163{
164 size_t i;
165
166 if (curr == NULL)
167 return;
168
169 if (curr->is_bound)
170 agp_unbind_memory(curr);
171
172 if (curr->type >= AGP_USER_TYPES) {
173 agp_generic_free_by_type(curr);
174 return;
175 }
176
177 if (curr->type != 0) {
178 curr->bridge->driver->free_by_type(curr);
179 return;
180 }
181 if (curr->page_count != 0) {
182 if (curr->bridge->driver->agp_destroy_pages) {
183 curr->bridge->driver->agp_destroy_pages(curr);
184 } else {
185
186 for (i = 0; i < curr->page_count; i++) {
187 curr->bridge->driver->agp_destroy_page(
188 curr->pages[i],
189 AGP_PAGE_DESTROY_UNMAP);
190 }
191 for (i = 0; i < curr->page_count; i++) {
192 curr->bridge->driver->agp_destroy_page(
193 curr->pages[i],
194 AGP_PAGE_DESTROY_FREE);
195 }
196 }
197 }
198 agp_free_key(curr->key);
199 agp_free_page_array(curr);
200 kfree(curr);
201}
202EXPORT_SYMBOL(agp_free_memory);
203
204#define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(unsigned long))
205
206/**
207 * agp_allocate_memory - allocate a group of pages of a certain type.
208 *
209 * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
210 * @page_count: size_t argument of the number of pages
211 * @type: u32 argument of the type of memory to be allocated.
212 *
213 * Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
214 * maps to physical ram. Any other type is device dependent.
215 *
216 * It returns NULL whenever memory is unavailable.
217 */
218struct agp_memory *agp_allocate_memory(struct agp_bridge_data *bridge,
219 size_t page_count, u32 type)
220{
221 int scratch_pages;
222 struct agp_memory *new;
223 size_t i;
224 int cur_memory;
225
226 if (!bridge)
227 return NULL;
228
229 cur_memory = atomic_read(&bridge->current_memory_agp);
230 if ((cur_memory + page_count > bridge->max_memory_agp) ||
231 (cur_memory + page_count < page_count))
232 return NULL;
233
234 if (type >= AGP_USER_TYPES) {
235 new = agp_generic_alloc_user(page_count, type);
236 if (new)
237 new->bridge = bridge;
238 return new;
239 }
240
241 if (type != 0) {
242 new = bridge->driver->alloc_by_type(page_count, type);
243 if (new)
244 new->bridge = bridge;
245 return new;
246 }
247
248 scratch_pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
249
250 new = agp_create_memory(scratch_pages);
251
252 if (new == NULL)
253 return NULL;
254
255 if (bridge->driver->agp_alloc_pages) {
256 if (bridge->driver->agp_alloc_pages(bridge, new, page_count)) {
257 agp_free_memory(new);
258 return NULL;
259 }
260 new->bridge = bridge;
261 return new;
262 }
263
264 for (i = 0; i < page_count; i++) {
265 struct page *page = bridge->driver->agp_alloc_page(bridge);
266
267 if (page == NULL) {
268 agp_free_memory(new);
269 return NULL;
270 }
271 new->pages[i] = page;
272 new->page_count++;
273 }
274 new->bridge = bridge;
275
276 return new;
277}
278EXPORT_SYMBOL(agp_allocate_memory);
279
280
281/* End - Generic routines for handling agp_memory structures */
282
283
284static int agp_return_size(void)
285{
286 int current_size;
287 void *temp;
288
289 temp = agp_bridge->current_size;
290
291 switch (agp_bridge->driver->size_type) {
292 case U8_APER_SIZE:
293 current_size = A_SIZE_8(temp)->size;
294 break;
295 case U16_APER_SIZE:
296 current_size = A_SIZE_16(temp)->size;
297 break;
298 case U32_APER_SIZE:
299 current_size = A_SIZE_32(temp)->size;
300 break;
301 case LVL2_APER_SIZE:
302 current_size = A_SIZE_LVL2(temp)->size;
303 break;
304 case FIXED_APER_SIZE:
305 current_size = A_SIZE_FIX(temp)->size;
306 break;
307 default:
308 current_size = 0;
309 break;
310 }
311
312 current_size -= (agp_memory_reserved / (1024*1024));
313 if (current_size <0)
314 current_size = 0;
315 return current_size;
316}
317
318
319int agp_num_entries(void)
320{
321 int num_entries;
322 void *temp;
323
324 temp = agp_bridge->current_size;
325
326 switch (agp_bridge->driver->size_type) {
327 case U8_APER_SIZE:
328 num_entries = A_SIZE_8(temp)->num_entries;
329 break;
330 case U16_APER_SIZE:
331 num_entries = A_SIZE_16(temp)->num_entries;
332 break;
333 case U32_APER_SIZE:
334 num_entries = A_SIZE_32(temp)->num_entries;
335 break;
336 case LVL2_APER_SIZE:
337 num_entries = A_SIZE_LVL2(temp)->num_entries;
338 break;
339 case FIXED_APER_SIZE:
340 num_entries = A_SIZE_FIX(temp)->num_entries;
341 break;
342 default:
343 num_entries = 0;
344 break;
345 }
346
347 num_entries -= agp_memory_reserved>>PAGE_SHIFT;
348 if (num_entries<0)
349 num_entries = 0;
350 return num_entries;
351}
352EXPORT_SYMBOL_GPL(agp_num_entries);
353
354
355/**
356 * agp_copy_info - copy bridge state information
357 *
358 * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
359 * @info: agp_kern_info pointer. The caller should insure that this pointer is valid.
360 *
361 * This function copies information about the agp bridge device and the state of
362 * the agp backend into an agp_kern_info pointer.
363 */
364int agp_copy_info(struct agp_bridge_data *bridge, struct agp_kern_info *info)
365{
366 memset(info, 0, sizeof(struct agp_kern_info));
367 if (!bridge) {
368 info->chipset = NOT_SUPPORTED;
369 return -EIO;
370 }
371
372 info->version.major = bridge->version->major;
373 info->version.minor = bridge->version->minor;
374 info->chipset = SUPPORTED;
375 info->device = bridge->dev;
376 if (bridge->mode & AGPSTAT_MODE_3_0)
377 info->mode = bridge->mode & ~AGP3_RESERVED_MASK;
378 else
379 info->mode = bridge->mode & ~AGP2_RESERVED_MASK;
380 info->aper_base = bridge->gart_bus_addr;
381 info->aper_size = agp_return_size();
382 info->max_memory = bridge->max_memory_agp;
383 info->current_memory = atomic_read(&bridge->current_memory_agp);
384 info->cant_use_aperture = bridge->driver->cant_use_aperture;
385 info->vm_ops = bridge->vm_ops;
386 info->page_mask = ~0UL;
387 return 0;
388}
389EXPORT_SYMBOL(agp_copy_info);
390
391/* End - Routine to copy over information structure */
392
393/*
394 * Routines for handling swapping of agp_memory into the GATT -
395 * These routines take agp_memory and insert them into the GATT.
396 * They call device specific routines to actually write to the GATT.
397 */
398
399/**
400 * agp_bind_memory - Bind an agp_memory structure into the GATT.
401 *
402 * @curr: agp_memory pointer
403 * @pg_start: an offset into the graphics aperture translation table
404 *
405 * It returns -EINVAL if the pointer == NULL.
406 * It returns -EBUSY if the area of the table requested is already in use.
407 */
408int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
409{
410 int ret_val;
411
412 if (curr == NULL)
413 return -EINVAL;
414
415 if (curr->is_bound) {
416 printk(KERN_INFO PFX "memory %p is already bound!\n", curr);
417 return -EINVAL;
418 }
419 if (!curr->is_flushed) {
420 curr->bridge->driver->cache_flush();
421 curr->is_flushed = true;
422 }
423
424 ret_val = curr->bridge->driver->insert_memory(curr, pg_start, curr->type);
425
426 if (ret_val != 0)
427 return ret_val;
428
429 curr->is_bound = true;
430 curr->pg_start = pg_start;
431 spin_lock(&agp_bridge->mapped_lock);
432 list_add(&curr->mapped_list, &agp_bridge->mapped_list);
433 spin_unlock(&agp_bridge->mapped_lock);
434
435 return 0;
436}
437EXPORT_SYMBOL(agp_bind_memory);
438
439
440/**
441 * agp_unbind_memory - Removes an agp_memory structure from the GATT
442 *
443 * @curr: agp_memory pointer to be removed from the GATT.
444 *
445 * It returns -EINVAL if this piece of agp_memory is not currently bound to
446 * the graphics aperture translation table or if the agp_memory pointer == NULL
447 */
448int agp_unbind_memory(struct agp_memory *curr)
449{
450 int ret_val;
451
452 if (curr == NULL)
453 return -EINVAL;
454
455 if (!curr->is_bound) {
456 printk(KERN_INFO PFX "memory %p was not bound!\n", curr);
457 return -EINVAL;
458 }
459
460 ret_val = curr->bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
461
462 if (ret_val != 0)
463 return ret_val;
464
465 curr->is_bound = false;
466 curr->pg_start = 0;
467 spin_lock(&curr->bridge->mapped_lock);
468 list_del(&curr->mapped_list);
469 spin_unlock(&curr->bridge->mapped_lock);
470 return 0;
471}
472EXPORT_SYMBOL(agp_unbind_memory);
473
474
475/* End - Routines for handling swapping of agp_memory into the GATT */
476
477
478/* Generic Agp routines - Start */
479static void agp_v2_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
480{
481 u32 tmp;
482
483 if (*requested_mode & AGP2_RESERVED_MASK) {
484 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
485 *requested_mode & AGP2_RESERVED_MASK, *requested_mode);
486 *requested_mode &= ~AGP2_RESERVED_MASK;
487 }
488
489 /*
490 * Some dumb bridges are programmed to disobey the AGP2 spec.
491 * This is likely a BIOS misprogramming rather than poweron default, or
492 * it would be a lot more common.
493 * https://bugs.freedesktop.org/show_bug.cgi?id=8816
494 * AGPv2 spec 6.1.9 states:
495 * The RATE field indicates the data transfer rates supported by this
496 * device. A.G.P. devices must report all that apply.
497 * Fix them up as best we can.
498 */
499 switch (*bridge_agpstat & 7) {
500 case 4:
501 *bridge_agpstat |= (AGPSTAT2_2X | AGPSTAT2_1X);
502 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x4 rate. "
503 "Fixing up support for x2 & x1\n");
504 break;
505 case 2:
506 *bridge_agpstat |= AGPSTAT2_1X;
507 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x2 rate. "
508 "Fixing up support for x1\n");
509 break;
510 default:
511 break;
512 }
513
514 /* Check the speed bits make sense. Only one should be set. */
515 tmp = *requested_mode & 7;
516 switch (tmp) {
517 case 0:
518 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to x1 mode.\n", current->comm);
519 *requested_mode |= AGPSTAT2_1X;
520 break;
521 case 1:
522 case 2:
523 break;
524 case 3:
525 *requested_mode &= ~(AGPSTAT2_1X); /* rate=2 */
526 break;
527 case 4:
528 break;
529 case 5:
530 case 6:
531 case 7:
532 *requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/
533 break;
534 }
535
536 /* disable SBA if it's not supported */
537 if (!((*bridge_agpstat & AGPSTAT_SBA) && (*vga_agpstat & AGPSTAT_SBA) && (*requested_mode & AGPSTAT_SBA)))
538 *bridge_agpstat &= ~AGPSTAT_SBA;
539
540 /* Set rate */
541 if (!((*bridge_agpstat & AGPSTAT2_4X) && (*vga_agpstat & AGPSTAT2_4X) && (*requested_mode & AGPSTAT2_4X)))
542 *bridge_agpstat &= ~AGPSTAT2_4X;
543
544 if (!((*bridge_agpstat & AGPSTAT2_2X) && (*vga_agpstat & AGPSTAT2_2X) && (*requested_mode & AGPSTAT2_2X)))
545 *bridge_agpstat &= ~AGPSTAT2_2X;
546
547 if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X)))
548 *bridge_agpstat &= ~AGPSTAT2_1X;
549
550 /* Now we know what mode it should be, clear out the unwanted bits. */
551 if (*bridge_agpstat & AGPSTAT2_4X)
552 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X); /* 4X */
553
554 if (*bridge_agpstat & AGPSTAT2_2X)
555 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X); /* 2X */
556
557 if (*bridge_agpstat & AGPSTAT2_1X)
558 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X); /* 1X */
559
560 /* Apply any errata. */
561 if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
562 *bridge_agpstat &= ~AGPSTAT_FW;
563
564 if (agp_bridge->flags & AGP_ERRATA_SBA)
565 *bridge_agpstat &= ~AGPSTAT_SBA;
566
567 if (agp_bridge->flags & AGP_ERRATA_1X) {
568 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
569 *bridge_agpstat |= AGPSTAT2_1X;
570 }
571
572 /* If we've dropped down to 1X, disable fast writes. */
573 if (*bridge_agpstat & AGPSTAT2_1X)
574 *bridge_agpstat &= ~AGPSTAT_FW;
575}
576
577/*
578 * requested_mode = Mode requested by (typically) X.
579 * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
580 * vga_agpstat = PCI_AGP_STATUS from graphic card.
581 */
582static void agp_v3_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
583{
584 u32 origbridge=*bridge_agpstat, origvga=*vga_agpstat;
585 u32 tmp;
586
587 if (*requested_mode & AGP3_RESERVED_MASK) {
588 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
589 *requested_mode & AGP3_RESERVED_MASK, *requested_mode);
590 *requested_mode &= ~AGP3_RESERVED_MASK;
591 }
592
593 /* Check the speed bits make sense. */
594 tmp = *requested_mode & 7;
595 if (tmp == 0) {
596 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current->comm);
597 *requested_mode |= AGPSTAT3_4X;
598 }
599 if (tmp >= 3) {
600 printk(KERN_INFO PFX "%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current->comm, tmp * 4);
601 *requested_mode = (*requested_mode & ~7) | AGPSTAT3_8X;
602 }
603
604 /* ARQSZ - Set the value to the maximum one.
605 * Don't allow the mode register to override values. */
606 *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_ARQSZ) |
607 max_t(u32,(*bridge_agpstat & AGPSTAT_ARQSZ),(*vga_agpstat & AGPSTAT_ARQSZ)));
608
609 /* Calibration cycle.
610 * Don't allow the mode register to override values. */
611 *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_CAL_MASK) |
612 min_t(u32,(*bridge_agpstat & AGPSTAT_CAL_MASK),(*vga_agpstat & AGPSTAT_CAL_MASK)));
613
614 /* SBA *must* be supported for AGP v3 */
615 *bridge_agpstat |= AGPSTAT_SBA;
616
617 /*
618 * Set speed.
619 * Check for invalid speeds. This can happen when applications
620 * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
621 */
622 if (*requested_mode & AGPSTAT_MODE_3_0) {
623 /*
624 * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
625 * have been passed a 3.0 mode, but with 2.x speed bits set.
626 * AGP2.x 4x -> AGP3.0 4x.
627 */
628 if (*requested_mode & AGPSTAT2_4X) {
629 printk(KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
630 current->comm, *requested_mode);
631 *requested_mode &= ~AGPSTAT2_4X;
632 *requested_mode |= AGPSTAT3_4X;
633 }
634 } else {
635 /*
636 * The caller doesn't know what they are doing. We are in 3.0 mode,
637 * but have been passed an AGP 2.x mode.
638 * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
639 */
640 printk(KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
641 current->comm, *requested_mode);
642 *requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
643 *requested_mode |= AGPSTAT3_4X;
644 }
645
646 if (*requested_mode & AGPSTAT3_8X) {
647 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
648 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
649 *bridge_agpstat |= AGPSTAT3_4X;
650 printk(KERN_INFO PFX "%s requested AGPx8 but bridge not capable.\n", current->comm);
651 return;
652 }
653 if (!(*vga_agpstat & AGPSTAT3_8X)) {
654 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
655 *bridge_agpstat |= AGPSTAT3_4X;
656 printk(KERN_INFO PFX "%s requested AGPx8 but graphic card not capable.\n", current->comm);
657 return;
658 }
659 /* All set, bridge & device can do AGP x8*/
660 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
661 goto done;
662
663 } else if (*requested_mode & AGPSTAT3_4X) {
664 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
665 *bridge_agpstat |= AGPSTAT3_4X;
666 goto done;
667
668 } else {
669
670 /*
671 * If we didn't specify an AGP mode, we see if both
672 * the graphics card, and the bridge can do x8, and use if so.
673 * If not, we fall back to x4 mode.
674 */
675 if ((*bridge_agpstat & AGPSTAT3_8X) && (*vga_agpstat & AGPSTAT3_8X)) {
676 printk(KERN_INFO PFX "No AGP mode specified. Setting to highest mode "
677 "supported by bridge & card (x8).\n");
678 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
679 *vga_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
680 } else {
681 printk(KERN_INFO PFX "Fell back to AGPx4 mode because ");
682 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
683 printk(KERN_INFO PFX "bridge couldn't do x8. bridge_agpstat:%x (orig=%x)\n",
684 *bridge_agpstat, origbridge);
685 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
686 *bridge_agpstat |= AGPSTAT3_4X;
687 }
688 if (!(*vga_agpstat & AGPSTAT3_8X)) {
689 printk(KERN_INFO PFX "graphics card couldn't do x8. vga_agpstat:%x (orig=%x)\n",
690 *vga_agpstat, origvga);
691 *vga_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
692 *vga_agpstat |= AGPSTAT3_4X;
693 }
694 }
695 }
696
697done:
698 /* Apply any errata. */
699 if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
700 *bridge_agpstat &= ~AGPSTAT_FW;
701
702 if (agp_bridge->flags & AGP_ERRATA_SBA)
703 *bridge_agpstat &= ~AGPSTAT_SBA;
704
705 if (agp_bridge->flags & AGP_ERRATA_1X) {
706 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
707 *bridge_agpstat |= AGPSTAT2_1X;
708 }
709}
710
711
712/**
713 * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
714 * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
715 * @requested_mode: requested agp_stat from userspace (Typically from X)
716 * @bridge_agpstat: current agp_stat from AGP bridge.
717 *
718 * This function will hunt for an AGP graphics card, and try to match
719 * the requested mode to the capabilities of both the bridge and the card.
720 */
721u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode, u32 bridge_agpstat)
722{
723 struct pci_dev *device = NULL;
724 u32 vga_agpstat;
725 u8 cap_ptr;
726
727 for (;;) {
728 device = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, device);
729 if (!device) {
730 printk(KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
731 return 0;
732 }
733 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
734 if (cap_ptr)
735 break;
736 }
737
738 /*
739 * Ok, here we have a AGP device. Disable impossible
740 * settings, and adjust the readqueue to the minimum.
741 */
742 pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &vga_agpstat);
743
744 /* adjust RQ depth */
745 bridge_agpstat = ((bridge_agpstat & ~AGPSTAT_RQ_DEPTH) |
746 min_t(u32, (requested_mode & AGPSTAT_RQ_DEPTH),
747 min_t(u32, (bridge_agpstat & AGPSTAT_RQ_DEPTH), (vga_agpstat & AGPSTAT_RQ_DEPTH))));
748
749 /* disable FW if it's not supported */
750 if (!((bridge_agpstat & AGPSTAT_FW) &&
751 (vga_agpstat & AGPSTAT_FW) &&
752 (requested_mode & AGPSTAT_FW)))
753 bridge_agpstat &= ~AGPSTAT_FW;
754
755 /* Check to see if we are operating in 3.0 mode */
756 if (agp_bridge->mode & AGPSTAT_MODE_3_0)
757 agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
758 else
759 agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
760
761 pci_dev_put(device);
762 return bridge_agpstat;
763}
764EXPORT_SYMBOL(agp_collect_device_status);
765
766
767void agp_device_command(u32 bridge_agpstat, bool agp_v3)
768{
769 struct pci_dev *device = NULL;
770 int mode;
771
772 mode = bridge_agpstat & 0x7;
773 if (agp_v3)
774 mode *= 4;
775
776 for_each_pci_dev(device) {
777 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
778 if (!agp)
779 continue;
780
781 dev_info(&device->dev, "putting AGP V%d device into %dx mode\n",
782 agp_v3 ? 3 : 2, mode);
783 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, bridge_agpstat);
784 }
785}
786EXPORT_SYMBOL(agp_device_command);
787
788
789void get_agp_version(struct agp_bridge_data *bridge)
790{
791 u32 ncapid;
792
793 /* Exit early if already set by errata workarounds. */
794 if (bridge->major_version != 0)
795 return;
796
797 pci_read_config_dword(bridge->dev, bridge->capndx, &ncapid);
798 bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
799 bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
800}
801EXPORT_SYMBOL(get_agp_version);
802
803
804void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode)
805{
806 u32 bridge_agpstat, temp;
807
808 get_agp_version(agp_bridge);
809
810 dev_info(&agp_bridge->dev->dev, "AGP %d.%d bridge\n",
811 agp_bridge->major_version, agp_bridge->minor_version);
812
813 pci_read_config_dword(agp_bridge->dev,
814 agp_bridge->capndx + PCI_AGP_STATUS, &bridge_agpstat);
815
816 bridge_agpstat = agp_collect_device_status(agp_bridge, requested_mode, bridge_agpstat);
817 if (bridge_agpstat == 0)
818 /* Something bad happened. FIXME: Return error code? */
819 return;
820
821 bridge_agpstat |= AGPSTAT_AGP_ENABLE;
822
823 /* Do AGP version specific frobbing. */
824 if (bridge->major_version >= 3) {
825 if (bridge->mode & AGPSTAT_MODE_3_0) {
826 /* If we have 3.5, we can do the isoch stuff. */
827 if (bridge->minor_version >= 5)
828 agp_3_5_enable(bridge);
829 agp_device_command(bridge_agpstat, true);
830 return;
831 } else {
832 /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
833 bridge_agpstat &= ~(7<<10) ;
834 pci_read_config_dword(bridge->dev,
835 bridge->capndx+AGPCTRL, &temp);
836 temp |= (1<<9);
837 pci_write_config_dword(bridge->dev,
838 bridge->capndx+AGPCTRL, temp);
839
840 dev_info(&bridge->dev->dev, "bridge is in legacy mode, falling back to 2.x\n");
841 }
842 }
843
844 /* AGP v<3 */
845 agp_device_command(bridge_agpstat, false);
846}
847EXPORT_SYMBOL(agp_generic_enable);
848
849
850int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
851{
852 char *table;
853 char *table_end;
854 int page_order;
855 int num_entries;
856 int i;
857 void *temp;
858 struct page *page;
859
860 /* The generic routines can't handle 2 level gatt's */
861 if (bridge->driver->size_type == LVL2_APER_SIZE)
862 return -EINVAL;
863
864 table = NULL;
865 i = bridge->aperture_size_idx;
866 temp = bridge->current_size;
867 page_order = num_entries = 0;
868
869 if (bridge->driver->size_type != FIXED_APER_SIZE) {
870 do {
871 switch (bridge->driver->size_type) {
872 case U8_APER_SIZE:
873 page_order =
874 A_SIZE_8(temp)->page_order;
875 num_entries =
876 A_SIZE_8(temp)->num_entries;
877 break;
878 case U16_APER_SIZE:
879 page_order = A_SIZE_16(temp)->page_order;
880 num_entries = A_SIZE_16(temp)->num_entries;
881 break;
882 case U32_APER_SIZE:
883 page_order = A_SIZE_32(temp)->page_order;
884 num_entries = A_SIZE_32(temp)->num_entries;
885 break;
886 /* This case will never really happen. */
887 case FIXED_APER_SIZE:
888 case LVL2_APER_SIZE:
889 default:
890 page_order = num_entries = 0;
891 break;
892 }
893
894 table = alloc_gatt_pages(page_order);
895
896 if (table == NULL) {
897 i++;
898 switch (bridge->driver->size_type) {
899 case U8_APER_SIZE:
900 bridge->current_size = A_IDX8(bridge);
901 break;
902 case U16_APER_SIZE:
903 bridge->current_size = A_IDX16(bridge);
904 break;
905 case U32_APER_SIZE:
906 bridge->current_size = A_IDX32(bridge);
907 break;
908 /* These cases will never really happen. */
909 case FIXED_APER_SIZE:
910 case LVL2_APER_SIZE:
911 default:
912 break;
913 }
914 temp = bridge->current_size;
915 } else {
916 bridge->aperture_size_idx = i;
917 }
918 } while (!table && (i < bridge->driver->num_aperture_sizes));
919 } else {
920 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
921 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
922 table = alloc_gatt_pages(page_order);
923 }
924
925 if (table == NULL)
926 return -ENOMEM;
927
928 table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
929
930 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
931 SetPageReserved(page);
932
933 bridge->gatt_table_real = (u32 *) table;
934 agp_gatt_table = (void *)table;
935
936 bridge->driver->cache_flush();
937#ifdef CONFIG_X86
938 if (set_memory_uc((unsigned long)table, 1 << page_order))
939 printk(KERN_WARNING "Could not set GATT table memory to UC!\n");
940
941 bridge->gatt_table = (u32 __iomem *)table;
942#else
943 bridge->gatt_table = ioremap(virt_to_phys(table),
944 (PAGE_SIZE * (1 << page_order)));
945 bridge->driver->cache_flush();
946#endif
947
948 if (bridge->gatt_table == NULL) {
949 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
950 ClearPageReserved(page);
951
952 free_gatt_pages(table, page_order);
953
954 return -ENOMEM;
955 }
956 bridge->gatt_bus_addr = virt_to_phys(bridge->gatt_table_real);
957
958 /* AK: bogus, should encode addresses > 4GB */
959 for (i = 0; i < num_entries; i++) {
960 writel(bridge->scratch_page, bridge->gatt_table+i);
961 readl(bridge->gatt_table+i); /* PCI Posting. */
962 }
963
964 return 0;
965}
966EXPORT_SYMBOL(agp_generic_create_gatt_table);
967
968int agp_generic_free_gatt_table(struct agp_bridge_data *bridge)
969{
970 int page_order;
971 char *table, *table_end;
972 void *temp;
973 struct page *page;
974
975 temp = bridge->current_size;
976
977 switch (bridge->driver->size_type) {
978 case U8_APER_SIZE:
979 page_order = A_SIZE_8(temp)->page_order;
980 break;
981 case U16_APER_SIZE:
982 page_order = A_SIZE_16(temp)->page_order;
983 break;
984 case U32_APER_SIZE:
985 page_order = A_SIZE_32(temp)->page_order;
986 break;
987 case FIXED_APER_SIZE:
988 page_order = A_SIZE_FIX(temp)->page_order;
989 break;
990 case LVL2_APER_SIZE:
991 /* The generic routines can't deal with 2 level gatt's */
992 return -EINVAL;
993 default:
994 page_order = 0;
995 break;
996 }
997
998 /* Do not worry about freeing memory, because if this is
999 * called, then all agp memory is deallocated and removed
1000 * from the table. */
1001
1002#ifdef CONFIG_X86
1003 set_memory_wb((unsigned long)bridge->gatt_table, 1 << page_order);
1004#else
1005 iounmap(bridge->gatt_table);
1006#endif
1007 table = (char *) bridge->gatt_table_real;
1008 table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
1009
1010 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
1011 ClearPageReserved(page);
1012
1013 free_gatt_pages(bridge->gatt_table_real, page_order);
1014
1015 agp_gatt_table = NULL;
1016 bridge->gatt_table = NULL;
1017 bridge->gatt_table_real = NULL;
1018 bridge->gatt_bus_addr = 0;
1019
1020 return 0;
1021}
1022EXPORT_SYMBOL(agp_generic_free_gatt_table);
1023
1024
1025int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
1026{
1027 int num_entries;
1028 size_t i;
1029 off_t j;
1030 void *temp;
1031 struct agp_bridge_data *bridge;
1032 int mask_type;
1033
1034 bridge = mem->bridge;
1035 if (!bridge)
1036 return -EINVAL;
1037
1038 if (mem->page_count == 0)
1039 return 0;
1040
1041 temp = bridge->current_size;
1042
1043 switch (bridge->driver->size_type) {
1044 case U8_APER_SIZE:
1045 num_entries = A_SIZE_8(temp)->num_entries;
1046 break;
1047 case U16_APER_SIZE:
1048 num_entries = A_SIZE_16(temp)->num_entries;
1049 break;
1050 case U32_APER_SIZE:
1051 num_entries = A_SIZE_32(temp)->num_entries;
1052 break;
1053 case FIXED_APER_SIZE:
1054 num_entries = A_SIZE_FIX(temp)->num_entries;
1055 break;
1056 case LVL2_APER_SIZE:
1057 /* The generic routines can't deal with 2 level gatt's */
1058 return -EINVAL;
1059 default:
1060 num_entries = 0;
1061 break;
1062 }
1063
1064 num_entries -= agp_memory_reserved/PAGE_SIZE;
1065 if (num_entries < 0) num_entries = 0;
1066
1067 if (type != mem->type)
1068 return -EINVAL;
1069
1070 mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1071 if (mask_type != 0) {
1072 /* The generic routines know nothing of memory types */
1073 return -EINVAL;
1074 }
1075
1076 if (((pg_start + mem->page_count) > num_entries) ||
1077 ((pg_start + mem->page_count) < pg_start))
1078 return -EINVAL;
1079
1080 j = pg_start;
1081
1082 while (j < (pg_start + mem->page_count)) {
1083 if (!PGE_EMPTY(bridge, readl(bridge->gatt_table+j)))
1084 return -EBUSY;
1085 j++;
1086 }
1087
1088 if (!mem->is_flushed) {
1089 bridge->driver->cache_flush();
1090 mem->is_flushed = true;
1091 }
1092
1093 for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
1094 writel(bridge->driver->mask_memory(bridge,
1095 page_to_phys(mem->pages[i]),
1096 mask_type),
1097 bridge->gatt_table+j);
1098 }
1099 readl(bridge->gatt_table+j-1); /* PCI Posting. */
1100
1101 bridge->driver->tlb_flush(mem);
1102 return 0;
1103}
1104EXPORT_SYMBOL(agp_generic_insert_memory);
1105
1106
1107int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
1108{
1109 size_t i;
1110 struct agp_bridge_data *bridge;
1111 int mask_type, num_entries;
1112
1113 bridge = mem->bridge;
1114 if (!bridge)
1115 return -EINVAL;
1116
1117 if (mem->page_count == 0)
1118 return 0;
1119
1120 if (type != mem->type)
1121 return -EINVAL;
1122
1123 num_entries = agp_num_entries();
1124 if (((pg_start + mem->page_count) > num_entries) ||
1125 ((pg_start + mem->page_count) < pg_start))
1126 return -EINVAL;
1127
1128 mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1129 if (mask_type != 0) {
1130 /* The generic routines know nothing of memory types */
1131 return -EINVAL;
1132 }
1133
1134 /* AK: bogus, should encode addresses > 4GB */
1135 for (i = pg_start; i < (mem->page_count + pg_start); i++) {
1136 writel(bridge->scratch_page, bridge->gatt_table+i);
1137 }
1138 readl(bridge->gatt_table+i-1); /* PCI Posting. */
1139
1140 bridge->driver->tlb_flush(mem);
1141 return 0;
1142}
1143EXPORT_SYMBOL(agp_generic_remove_memory);
1144
1145struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
1146{
1147 return NULL;
1148}
1149EXPORT_SYMBOL(agp_generic_alloc_by_type);
1150
1151void agp_generic_free_by_type(struct agp_memory *curr)
1152{
1153 agp_free_page_array(curr);
1154 agp_free_key(curr->key);
1155 kfree(curr);
1156}
1157EXPORT_SYMBOL(agp_generic_free_by_type);
1158
1159struct agp_memory *agp_generic_alloc_user(size_t page_count, int type)
1160{
1161 struct agp_memory *new;
1162 int i;
1163 int pages;
1164
1165 pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
1166 new = agp_create_user_memory(page_count);
1167 if (new == NULL)
1168 return NULL;
1169
1170 for (i = 0; i < page_count; i++)
1171 new->pages[i] = NULL;
1172 new->page_count = 0;
1173 new->type = type;
1174 new->num_scratch_pages = pages;
1175
1176 return new;
1177}
1178EXPORT_SYMBOL(agp_generic_alloc_user);
1179
1180/*
1181 * Basic Page Allocation Routines -
1182 * These routines handle page allocation and by default they reserve the allocated
1183 * memory. They also handle incrementing the current_memory_agp value, Which is checked
1184 * against a maximum value.
1185 */
1186
1187int agp_generic_alloc_pages(struct agp_bridge_data *bridge, struct agp_memory *mem, size_t num_pages)
1188{
1189 struct page * page;
1190 int i, ret = -ENOMEM;
1191
1192 for (i = 0; i < num_pages; i++) {
1193 page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1194 /* agp_free_memory() needs gart address */
1195 if (page == NULL)
1196 goto out;
1197
1198#ifndef CONFIG_X86
1199 map_page_into_agp(page);
1200#endif
1201 get_page(page);
1202 atomic_inc(&agp_bridge->current_memory_agp);
1203
1204 mem->pages[i] = page;
1205 mem->page_count++;
1206 }
1207
1208#ifdef CONFIG_X86
1209 set_pages_array_uc(mem->pages, num_pages);
1210#endif
1211 ret = 0;
1212out:
1213 return ret;
1214}
1215EXPORT_SYMBOL(agp_generic_alloc_pages);
1216
1217struct page *agp_generic_alloc_page(struct agp_bridge_data *bridge)
1218{
1219 struct page * page;
1220
1221 page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1222 if (page == NULL)
1223 return NULL;
1224
1225 map_page_into_agp(page);
1226
1227 get_page(page);
1228 atomic_inc(&agp_bridge->current_memory_agp);
1229 return page;
1230}
1231EXPORT_SYMBOL(agp_generic_alloc_page);
1232
1233void agp_generic_destroy_pages(struct agp_memory *mem)
1234{
1235 int i;
1236 struct page *page;
1237
1238 if (!mem)
1239 return;
1240
1241#ifdef CONFIG_X86
1242 set_pages_array_wb(mem->pages, mem->page_count);
1243#endif
1244
1245 for (i = 0; i < mem->page_count; i++) {
1246 page = mem->pages[i];
1247
1248#ifndef CONFIG_X86
1249 unmap_page_from_agp(page);
1250#endif
1251 put_page(page);
1252 __free_page(page);
1253 atomic_dec(&agp_bridge->current_memory_agp);
1254 mem->pages[i] = NULL;
1255 }
1256}
1257EXPORT_SYMBOL(agp_generic_destroy_pages);
1258
1259void agp_generic_destroy_page(struct page *page, int flags)
1260{
1261 if (page == NULL)
1262 return;
1263
1264 if (flags & AGP_PAGE_DESTROY_UNMAP)
1265 unmap_page_from_agp(page);
1266
1267 if (flags & AGP_PAGE_DESTROY_FREE) {
1268 put_page(page);
1269 __free_page(page);
1270 atomic_dec(&agp_bridge->current_memory_agp);
1271 }
1272}
1273EXPORT_SYMBOL(agp_generic_destroy_page);
1274
1275/* End Basic Page Allocation Routines */
1276
1277
1278/**
1279 * agp_enable - initialise the agp point-to-point connection.
1280 *
1281 * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
1282 * @mode: agp mode register value to configure with.
1283 */
1284void agp_enable(struct agp_bridge_data *bridge, u32 mode)
1285{
1286 if (!bridge)
1287 return;
1288 bridge->driver->agp_enable(bridge, mode);
1289}
1290EXPORT_SYMBOL(agp_enable);
1291
1292/* When we remove the global variable agp_bridge from all drivers
1293 * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1294 */
1295
1296struct agp_bridge_data *agp_generic_find_bridge(struct pci_dev *pdev)
1297{
1298 if (list_empty(&agp_bridges))
1299 return NULL;
1300
1301 return agp_bridge;
1302}
1303
1304static void ipi_handler(void *null)
1305{
1306 flush_agp_cache();
1307}
1308
1309void global_cache_flush(void)
1310{
1311 on_each_cpu(ipi_handler, NULL, 1);
1312}
1313EXPORT_SYMBOL(global_cache_flush);
1314
1315unsigned long agp_generic_mask_memory(struct agp_bridge_data *bridge,
1316 dma_addr_t addr, int type)
1317{
1318 /* memory type is ignored in the generic routine */
1319 if (bridge->driver->masks)
1320 return addr | bridge->driver->masks[0].mask;
1321 else
1322 return addr;
1323}
1324EXPORT_SYMBOL(agp_generic_mask_memory);
1325
1326int agp_generic_type_to_mask_type(struct agp_bridge_data *bridge,
1327 int type)
1328{
1329 if (type >= AGP_USER_TYPES)
1330 return 0;
1331 return type;
1332}
1333EXPORT_SYMBOL(agp_generic_type_to_mask_type);
1334
1335/*
1336 * These functions are implemented according to the AGPv3 spec,
1337 * which covers implementation details that had previously been
1338 * left open.
1339 */
1340
1341int agp3_generic_fetch_size(void)
1342{
1343 u16 temp_size;
1344 int i;
1345 struct aper_size_info_16 *values;
1346
1347 pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1348 values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1349
1350 for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1351 if (temp_size == values[i].size_value) {
1352 agp_bridge->previous_size =
1353 agp_bridge->current_size = (void *) (values + i);
1354
1355 agp_bridge->aperture_size_idx = i;
1356 return values[i].size;
1357 }
1358 }
1359 return 0;
1360}
1361EXPORT_SYMBOL(agp3_generic_fetch_size);
1362
1363void agp3_generic_tlbflush(struct agp_memory *mem)
1364{
1365 u32 ctrl;
1366 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1367 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1368 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1369}
1370EXPORT_SYMBOL(agp3_generic_tlbflush);
1371
1372int agp3_generic_configure(void)
1373{
1374 u32 temp;
1375 struct aper_size_info_16 *current_size;
1376
1377 current_size = A_SIZE_16(agp_bridge->current_size);
1378
1379 agp_bridge->gart_bus_addr = pci_bus_address(agp_bridge->dev,
1380 AGP_APERTURE_BAR);
1381
1382 /* set aperture size */
1383 pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1384 /* set gart pointer */
1385 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1386 /* enable aperture and GTLB */
1387 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1388 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1389 return 0;
1390}
1391EXPORT_SYMBOL(agp3_generic_configure);
1392
1393void agp3_generic_cleanup(void)
1394{
1395 u32 ctrl;
1396 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1397 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1398}
1399EXPORT_SYMBOL(agp3_generic_cleanup);
1400
1401const struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1402{
1403 {4096, 1048576, 10,0x000},
1404 {2048, 524288, 9, 0x800},
1405 {1024, 262144, 8, 0xc00},
1406 { 512, 131072, 7, 0xe00},
1407 { 256, 65536, 6, 0xf00},
1408 { 128, 32768, 5, 0xf20},
1409 { 64, 16384, 4, 0xf30},
1410 { 32, 8192, 3, 0xf38},
1411 { 16, 4096, 2, 0xf3c},
1412 { 8, 2048, 1, 0xf3e},
1413 { 4, 1024, 0, 0xf3f}
1414};
1415EXPORT_SYMBOL(agp3_generic_sizes);
1416
1/*
2 * AGPGART driver.
3 * Copyright (C) 2004 Silicon Graphics, Inc.
4 * Copyright (C) 2002-2005 Dave Jones.
5 * Copyright (C) 1999 Jeff Hartmann.
6 * Copyright (C) 1999 Precision Insight, Inc.
7 * Copyright (C) 1999 Xi Graphics, Inc.
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be included
17 * in all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * JEFF HARTMANN, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM,
23 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
24 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
25 * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 *
27 * TODO:
28 * - Allocate more than order 0 pages to avoid too much linear map splitting.
29 */
30#include <linux/module.h>
31#include <linux/pci.h>
32#include <linux/init.h>
33#include <linux/pagemap.h>
34#include <linux/miscdevice.h>
35#include <linux/pm.h>
36#include <linux/agp_backend.h>
37#include <linux/vmalloc.h>
38#include <linux/dma-mapping.h>
39#include <linux/mm.h>
40#include <linux/sched.h>
41#include <linux/slab.h>
42#include <asm/io.h>
43#include <asm/cacheflush.h>
44#include <asm/pgtable.h>
45#include "agp.h"
46
47__u32 *agp_gatt_table;
48int agp_memory_reserved;
49
50/*
51 * Needed by the Nforce GART driver for the time being. Would be
52 * nice to do this some other way instead of needing this export.
53 */
54EXPORT_SYMBOL_GPL(agp_memory_reserved);
55
56/*
57 * Generic routines for handling agp_memory structures -
58 * They use the basic page allocation routines to do the brunt of the work.
59 */
60
61void agp_free_key(int key)
62{
63 if (key < 0)
64 return;
65
66 if (key < MAXKEY)
67 clear_bit(key, agp_bridge->key_list);
68}
69EXPORT_SYMBOL(agp_free_key);
70
71
72static int agp_get_key(void)
73{
74 int bit;
75
76 bit = find_first_zero_bit(agp_bridge->key_list, MAXKEY);
77 if (bit < MAXKEY) {
78 set_bit(bit, agp_bridge->key_list);
79 return bit;
80 }
81 return -1;
82}
83
84/*
85 * Use kmalloc if possible for the page list. Otherwise fall back to
86 * vmalloc. This speeds things up and also saves memory for small AGP
87 * regions.
88 */
89
90void agp_alloc_page_array(size_t size, struct agp_memory *mem)
91{
92 mem->pages = NULL;
93
94 if (size <= 2*PAGE_SIZE)
95 mem->pages = kmalloc(size, GFP_KERNEL | __GFP_NOWARN);
96 if (mem->pages == NULL) {
97 mem->pages = vmalloc(size);
98 }
99}
100EXPORT_SYMBOL(agp_alloc_page_array);
101
102void agp_free_page_array(struct agp_memory *mem)
103{
104 if (is_vmalloc_addr(mem->pages)) {
105 vfree(mem->pages);
106 } else {
107 kfree(mem->pages);
108 }
109}
110EXPORT_SYMBOL(agp_free_page_array);
111
112
113static struct agp_memory *agp_create_user_memory(unsigned long num_agp_pages)
114{
115 struct agp_memory *new;
116 unsigned long alloc_size = num_agp_pages*sizeof(struct page *);
117
118 if (INT_MAX/sizeof(struct page *) < num_agp_pages)
119 return NULL;
120
121 new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
122 if (new == NULL)
123 return NULL;
124
125 new->key = agp_get_key();
126
127 if (new->key < 0) {
128 kfree(new);
129 return NULL;
130 }
131
132 agp_alloc_page_array(alloc_size, new);
133
134 if (new->pages == NULL) {
135 agp_free_key(new->key);
136 kfree(new);
137 return NULL;
138 }
139 new->num_scratch_pages = 0;
140 return new;
141}
142
143struct agp_memory *agp_create_memory(int scratch_pages)
144{
145 struct agp_memory *new;
146
147 new = kzalloc(sizeof(struct agp_memory), GFP_KERNEL);
148 if (new == NULL)
149 return NULL;
150
151 new->key = agp_get_key();
152
153 if (new->key < 0) {
154 kfree(new);
155 return NULL;
156 }
157
158 agp_alloc_page_array(PAGE_SIZE * scratch_pages, new);
159
160 if (new->pages == NULL) {
161 agp_free_key(new->key);
162 kfree(new);
163 return NULL;
164 }
165 new->num_scratch_pages = scratch_pages;
166 new->type = AGP_NORMAL_MEMORY;
167 return new;
168}
169EXPORT_SYMBOL(agp_create_memory);
170
171/**
172 * agp_free_memory - free memory associated with an agp_memory pointer.
173 *
174 * @curr: agp_memory pointer to be freed.
175 *
176 * It is the only function that can be called when the backend is not owned
177 * by the caller. (So it can free memory on client death.)
178 */
179void agp_free_memory(struct agp_memory *curr)
180{
181 size_t i;
182
183 if (curr == NULL)
184 return;
185
186 if (curr->is_bound)
187 agp_unbind_memory(curr);
188
189 if (curr->type >= AGP_USER_TYPES) {
190 agp_generic_free_by_type(curr);
191 return;
192 }
193
194 if (curr->type != 0) {
195 curr->bridge->driver->free_by_type(curr);
196 return;
197 }
198 if (curr->page_count != 0) {
199 if (curr->bridge->driver->agp_destroy_pages) {
200 curr->bridge->driver->agp_destroy_pages(curr);
201 } else {
202
203 for (i = 0; i < curr->page_count; i++) {
204 curr->bridge->driver->agp_destroy_page(
205 curr->pages[i],
206 AGP_PAGE_DESTROY_UNMAP);
207 }
208 for (i = 0; i < curr->page_count; i++) {
209 curr->bridge->driver->agp_destroy_page(
210 curr->pages[i],
211 AGP_PAGE_DESTROY_FREE);
212 }
213 }
214 }
215 agp_free_key(curr->key);
216 agp_free_page_array(curr);
217 kfree(curr);
218}
219EXPORT_SYMBOL(agp_free_memory);
220
221#define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(unsigned long))
222
223/**
224 * agp_allocate_memory - allocate a group of pages of a certain type.
225 *
226 * @page_count: size_t argument of the number of pages
227 * @type: u32 argument of the type of memory to be allocated.
228 *
229 * Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
230 * maps to physical ram. Any other type is device dependent.
231 *
232 * It returns NULL whenever memory is unavailable.
233 */
234struct agp_memory *agp_allocate_memory(struct agp_bridge_data *bridge,
235 size_t page_count, u32 type)
236{
237 int scratch_pages;
238 struct agp_memory *new;
239 size_t i;
240 int cur_memory;
241
242 if (!bridge)
243 return NULL;
244
245 cur_memory = atomic_read(&bridge->current_memory_agp);
246 if ((cur_memory + page_count > bridge->max_memory_agp) ||
247 (cur_memory + page_count < page_count))
248 return NULL;
249
250 if (type >= AGP_USER_TYPES) {
251 new = agp_generic_alloc_user(page_count, type);
252 if (new)
253 new->bridge = bridge;
254 return new;
255 }
256
257 if (type != 0) {
258 new = bridge->driver->alloc_by_type(page_count, type);
259 if (new)
260 new->bridge = bridge;
261 return new;
262 }
263
264 scratch_pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
265
266 new = agp_create_memory(scratch_pages);
267
268 if (new == NULL)
269 return NULL;
270
271 if (bridge->driver->agp_alloc_pages) {
272 if (bridge->driver->agp_alloc_pages(bridge, new, page_count)) {
273 agp_free_memory(new);
274 return NULL;
275 }
276 new->bridge = bridge;
277 return new;
278 }
279
280 for (i = 0; i < page_count; i++) {
281 struct page *page = bridge->driver->agp_alloc_page(bridge);
282
283 if (page == NULL) {
284 agp_free_memory(new);
285 return NULL;
286 }
287 new->pages[i] = page;
288 new->page_count++;
289 }
290 new->bridge = bridge;
291
292 return new;
293}
294EXPORT_SYMBOL(agp_allocate_memory);
295
296
297/* End - Generic routines for handling agp_memory structures */
298
299
300static int agp_return_size(void)
301{
302 int current_size;
303 void *temp;
304
305 temp = agp_bridge->current_size;
306
307 switch (agp_bridge->driver->size_type) {
308 case U8_APER_SIZE:
309 current_size = A_SIZE_8(temp)->size;
310 break;
311 case U16_APER_SIZE:
312 current_size = A_SIZE_16(temp)->size;
313 break;
314 case U32_APER_SIZE:
315 current_size = A_SIZE_32(temp)->size;
316 break;
317 case LVL2_APER_SIZE:
318 current_size = A_SIZE_LVL2(temp)->size;
319 break;
320 case FIXED_APER_SIZE:
321 current_size = A_SIZE_FIX(temp)->size;
322 break;
323 default:
324 current_size = 0;
325 break;
326 }
327
328 current_size -= (agp_memory_reserved / (1024*1024));
329 if (current_size <0)
330 current_size = 0;
331 return current_size;
332}
333
334
335int agp_num_entries(void)
336{
337 int num_entries;
338 void *temp;
339
340 temp = agp_bridge->current_size;
341
342 switch (agp_bridge->driver->size_type) {
343 case U8_APER_SIZE:
344 num_entries = A_SIZE_8(temp)->num_entries;
345 break;
346 case U16_APER_SIZE:
347 num_entries = A_SIZE_16(temp)->num_entries;
348 break;
349 case U32_APER_SIZE:
350 num_entries = A_SIZE_32(temp)->num_entries;
351 break;
352 case LVL2_APER_SIZE:
353 num_entries = A_SIZE_LVL2(temp)->num_entries;
354 break;
355 case FIXED_APER_SIZE:
356 num_entries = A_SIZE_FIX(temp)->num_entries;
357 break;
358 default:
359 num_entries = 0;
360 break;
361 }
362
363 num_entries -= agp_memory_reserved>>PAGE_SHIFT;
364 if (num_entries<0)
365 num_entries = 0;
366 return num_entries;
367}
368EXPORT_SYMBOL_GPL(agp_num_entries);
369
370
371/**
372 * agp_copy_info - copy bridge state information
373 *
374 * @info: agp_kern_info pointer. The caller should insure that this pointer is valid.
375 *
376 * This function copies information about the agp bridge device and the state of
377 * the agp backend into an agp_kern_info pointer.
378 */
379int agp_copy_info(struct agp_bridge_data *bridge, struct agp_kern_info *info)
380{
381 memset(info, 0, sizeof(struct agp_kern_info));
382 if (!bridge) {
383 info->chipset = NOT_SUPPORTED;
384 return -EIO;
385 }
386
387 info->version.major = bridge->version->major;
388 info->version.minor = bridge->version->minor;
389 info->chipset = SUPPORTED;
390 info->device = bridge->dev;
391 if (bridge->mode & AGPSTAT_MODE_3_0)
392 info->mode = bridge->mode & ~AGP3_RESERVED_MASK;
393 else
394 info->mode = bridge->mode & ~AGP2_RESERVED_MASK;
395 info->aper_base = bridge->gart_bus_addr;
396 info->aper_size = agp_return_size();
397 info->max_memory = bridge->max_memory_agp;
398 info->current_memory = atomic_read(&bridge->current_memory_agp);
399 info->cant_use_aperture = bridge->driver->cant_use_aperture;
400 info->vm_ops = bridge->vm_ops;
401 info->page_mask = ~0UL;
402 return 0;
403}
404EXPORT_SYMBOL(agp_copy_info);
405
406/* End - Routine to copy over information structure */
407
408/*
409 * Routines for handling swapping of agp_memory into the GATT -
410 * These routines take agp_memory and insert them into the GATT.
411 * They call device specific routines to actually write to the GATT.
412 */
413
414/**
415 * agp_bind_memory - Bind an agp_memory structure into the GATT.
416 *
417 * @curr: agp_memory pointer
418 * @pg_start: an offset into the graphics aperture translation table
419 *
420 * It returns -EINVAL if the pointer == NULL.
421 * It returns -EBUSY if the area of the table requested is already in use.
422 */
423int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
424{
425 int ret_val;
426
427 if (curr == NULL)
428 return -EINVAL;
429
430 if (curr->is_bound) {
431 printk(KERN_INFO PFX "memory %p is already bound!\n", curr);
432 return -EINVAL;
433 }
434 if (!curr->is_flushed) {
435 curr->bridge->driver->cache_flush();
436 curr->is_flushed = true;
437 }
438
439 ret_val = curr->bridge->driver->insert_memory(curr, pg_start, curr->type);
440
441 if (ret_val != 0)
442 return ret_val;
443
444 curr->is_bound = true;
445 curr->pg_start = pg_start;
446 spin_lock(&agp_bridge->mapped_lock);
447 list_add(&curr->mapped_list, &agp_bridge->mapped_list);
448 spin_unlock(&agp_bridge->mapped_lock);
449
450 return 0;
451}
452EXPORT_SYMBOL(agp_bind_memory);
453
454
455/**
456 * agp_unbind_memory - Removes an agp_memory structure from the GATT
457 *
458 * @curr: agp_memory pointer to be removed from the GATT.
459 *
460 * It returns -EINVAL if this piece of agp_memory is not currently bound to
461 * the graphics aperture translation table or if the agp_memory pointer == NULL
462 */
463int agp_unbind_memory(struct agp_memory *curr)
464{
465 int ret_val;
466
467 if (curr == NULL)
468 return -EINVAL;
469
470 if (!curr->is_bound) {
471 printk(KERN_INFO PFX "memory %p was not bound!\n", curr);
472 return -EINVAL;
473 }
474
475 ret_val = curr->bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
476
477 if (ret_val != 0)
478 return ret_val;
479
480 curr->is_bound = false;
481 curr->pg_start = 0;
482 spin_lock(&curr->bridge->mapped_lock);
483 list_del(&curr->mapped_list);
484 spin_unlock(&curr->bridge->mapped_lock);
485 return 0;
486}
487EXPORT_SYMBOL(agp_unbind_memory);
488
489
490/* End - Routines for handling swapping of agp_memory into the GATT */
491
492
493/* Generic Agp routines - Start */
494static void agp_v2_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
495{
496 u32 tmp;
497
498 if (*requested_mode & AGP2_RESERVED_MASK) {
499 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
500 *requested_mode & AGP2_RESERVED_MASK, *requested_mode);
501 *requested_mode &= ~AGP2_RESERVED_MASK;
502 }
503
504 /*
505 * Some dumb bridges are programmed to disobey the AGP2 spec.
506 * This is likely a BIOS misprogramming rather than poweron default, or
507 * it would be a lot more common.
508 * https://bugs.freedesktop.org/show_bug.cgi?id=8816
509 * AGPv2 spec 6.1.9 states:
510 * The RATE field indicates the data transfer rates supported by this
511 * device. A.G.P. devices must report all that apply.
512 * Fix them up as best we can.
513 */
514 switch (*bridge_agpstat & 7) {
515 case 4:
516 *bridge_agpstat |= (AGPSTAT2_2X | AGPSTAT2_1X);
517 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x4 rate. "
518 "Fixing up support for x2 & x1\n");
519 break;
520 case 2:
521 *bridge_agpstat |= AGPSTAT2_1X;
522 printk(KERN_INFO PFX "BIOS bug. AGP bridge claims to only support x2 rate. "
523 "Fixing up support for x1\n");
524 break;
525 default:
526 break;
527 }
528
529 /* Check the speed bits make sense. Only one should be set. */
530 tmp = *requested_mode & 7;
531 switch (tmp) {
532 case 0:
533 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to x1 mode.\n", current->comm);
534 *requested_mode |= AGPSTAT2_1X;
535 break;
536 case 1:
537 case 2:
538 break;
539 case 3:
540 *requested_mode &= ~(AGPSTAT2_1X); /* rate=2 */
541 break;
542 case 4:
543 break;
544 case 5:
545 case 6:
546 case 7:
547 *requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/
548 break;
549 }
550
551 /* disable SBA if it's not supported */
552 if (!((*bridge_agpstat & AGPSTAT_SBA) && (*vga_agpstat & AGPSTAT_SBA) && (*requested_mode & AGPSTAT_SBA)))
553 *bridge_agpstat &= ~AGPSTAT_SBA;
554
555 /* Set rate */
556 if (!((*bridge_agpstat & AGPSTAT2_4X) && (*vga_agpstat & AGPSTAT2_4X) && (*requested_mode & AGPSTAT2_4X)))
557 *bridge_agpstat &= ~AGPSTAT2_4X;
558
559 if (!((*bridge_agpstat & AGPSTAT2_2X) && (*vga_agpstat & AGPSTAT2_2X) && (*requested_mode & AGPSTAT2_2X)))
560 *bridge_agpstat &= ~AGPSTAT2_2X;
561
562 if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X)))
563 *bridge_agpstat &= ~AGPSTAT2_1X;
564
565 /* Now we know what mode it should be, clear out the unwanted bits. */
566 if (*bridge_agpstat & AGPSTAT2_4X)
567 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X); /* 4X */
568
569 if (*bridge_agpstat & AGPSTAT2_2X)
570 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X); /* 2X */
571
572 if (*bridge_agpstat & AGPSTAT2_1X)
573 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X); /* 1X */
574
575 /* Apply any errata. */
576 if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
577 *bridge_agpstat &= ~AGPSTAT_FW;
578
579 if (agp_bridge->flags & AGP_ERRATA_SBA)
580 *bridge_agpstat &= ~AGPSTAT_SBA;
581
582 if (agp_bridge->flags & AGP_ERRATA_1X) {
583 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
584 *bridge_agpstat |= AGPSTAT2_1X;
585 }
586
587 /* If we've dropped down to 1X, disable fast writes. */
588 if (*bridge_agpstat & AGPSTAT2_1X)
589 *bridge_agpstat &= ~AGPSTAT_FW;
590}
591
592/*
593 * requested_mode = Mode requested by (typically) X.
594 * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
595 * vga_agpstat = PCI_AGP_STATUS from graphic card.
596 */
597static void agp_v3_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
598{
599 u32 origbridge=*bridge_agpstat, origvga=*vga_agpstat;
600 u32 tmp;
601
602 if (*requested_mode & AGP3_RESERVED_MASK) {
603 printk(KERN_INFO PFX "reserved bits set (%x) in mode 0x%x. Fixed.\n",
604 *requested_mode & AGP3_RESERVED_MASK, *requested_mode);
605 *requested_mode &= ~AGP3_RESERVED_MASK;
606 }
607
608 /* Check the speed bits make sense. */
609 tmp = *requested_mode & 7;
610 if (tmp == 0) {
611 printk(KERN_INFO PFX "%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current->comm);
612 *requested_mode |= AGPSTAT3_4X;
613 }
614 if (tmp >= 3) {
615 printk(KERN_INFO PFX "%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current->comm, tmp * 4);
616 *requested_mode = (*requested_mode & ~7) | AGPSTAT3_8X;
617 }
618
619 /* ARQSZ - Set the value to the maximum one.
620 * Don't allow the mode register to override values. */
621 *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_ARQSZ) |
622 max_t(u32,(*bridge_agpstat & AGPSTAT_ARQSZ),(*vga_agpstat & AGPSTAT_ARQSZ)));
623
624 /* Calibration cycle.
625 * Don't allow the mode register to override values. */
626 *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_CAL_MASK) |
627 min_t(u32,(*bridge_agpstat & AGPSTAT_CAL_MASK),(*vga_agpstat & AGPSTAT_CAL_MASK)));
628
629 /* SBA *must* be supported for AGP v3 */
630 *bridge_agpstat |= AGPSTAT_SBA;
631
632 /*
633 * Set speed.
634 * Check for invalid speeds. This can happen when applications
635 * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
636 */
637 if (*requested_mode & AGPSTAT_MODE_3_0) {
638 /*
639 * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
640 * have been passed a 3.0 mode, but with 2.x speed bits set.
641 * AGP2.x 4x -> AGP3.0 4x.
642 */
643 if (*requested_mode & AGPSTAT2_4X) {
644 printk(KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
645 current->comm, *requested_mode);
646 *requested_mode &= ~AGPSTAT2_4X;
647 *requested_mode |= AGPSTAT3_4X;
648 }
649 } else {
650 /*
651 * The caller doesn't know what they are doing. We are in 3.0 mode,
652 * but have been passed an AGP 2.x mode.
653 * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
654 */
655 printk(KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
656 current->comm, *requested_mode);
657 *requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
658 *requested_mode |= AGPSTAT3_4X;
659 }
660
661 if (*requested_mode & AGPSTAT3_8X) {
662 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
663 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
664 *bridge_agpstat |= AGPSTAT3_4X;
665 printk(KERN_INFO PFX "%s requested AGPx8 but bridge not capable.\n", current->comm);
666 return;
667 }
668 if (!(*vga_agpstat & AGPSTAT3_8X)) {
669 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
670 *bridge_agpstat |= AGPSTAT3_4X;
671 printk(KERN_INFO PFX "%s requested AGPx8 but graphic card not capable.\n", current->comm);
672 return;
673 }
674 /* All set, bridge & device can do AGP x8*/
675 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
676 goto done;
677
678 } else if (*requested_mode & AGPSTAT3_4X) {
679 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
680 *bridge_agpstat |= AGPSTAT3_4X;
681 goto done;
682
683 } else {
684
685 /*
686 * If we didn't specify an AGP mode, we see if both
687 * the graphics card, and the bridge can do x8, and use if so.
688 * If not, we fall back to x4 mode.
689 */
690 if ((*bridge_agpstat & AGPSTAT3_8X) && (*vga_agpstat & AGPSTAT3_8X)) {
691 printk(KERN_INFO PFX "No AGP mode specified. Setting to highest mode "
692 "supported by bridge & card (x8).\n");
693 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
694 *vga_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
695 } else {
696 printk(KERN_INFO PFX "Fell back to AGPx4 mode because ");
697 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
698 printk(KERN_INFO PFX "bridge couldn't do x8. bridge_agpstat:%x (orig=%x)\n",
699 *bridge_agpstat, origbridge);
700 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
701 *bridge_agpstat |= AGPSTAT3_4X;
702 }
703 if (!(*vga_agpstat & AGPSTAT3_8X)) {
704 printk(KERN_INFO PFX "graphics card couldn't do x8. vga_agpstat:%x (orig=%x)\n",
705 *vga_agpstat, origvga);
706 *vga_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
707 *vga_agpstat |= AGPSTAT3_4X;
708 }
709 }
710 }
711
712done:
713 /* Apply any errata. */
714 if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
715 *bridge_agpstat &= ~AGPSTAT_FW;
716
717 if (agp_bridge->flags & AGP_ERRATA_SBA)
718 *bridge_agpstat &= ~AGPSTAT_SBA;
719
720 if (agp_bridge->flags & AGP_ERRATA_1X) {
721 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
722 *bridge_agpstat |= AGPSTAT2_1X;
723 }
724}
725
726
727/**
728 * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
729 * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
730 * @requested_mode: requested agp_stat from userspace (Typically from X)
731 * @bridge_agpstat: current agp_stat from AGP bridge.
732 *
733 * This function will hunt for an AGP graphics card, and try to match
734 * the requested mode to the capabilities of both the bridge and the card.
735 */
736u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode, u32 bridge_agpstat)
737{
738 struct pci_dev *device = NULL;
739 u32 vga_agpstat;
740 u8 cap_ptr;
741
742 for (;;) {
743 device = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, device);
744 if (!device) {
745 printk(KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
746 return 0;
747 }
748 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
749 if (cap_ptr)
750 break;
751 }
752
753 /*
754 * Ok, here we have a AGP device. Disable impossible
755 * settings, and adjust the readqueue to the minimum.
756 */
757 pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &vga_agpstat);
758
759 /* adjust RQ depth */
760 bridge_agpstat = ((bridge_agpstat & ~AGPSTAT_RQ_DEPTH) |
761 min_t(u32, (requested_mode & AGPSTAT_RQ_DEPTH),
762 min_t(u32, (bridge_agpstat & AGPSTAT_RQ_DEPTH), (vga_agpstat & AGPSTAT_RQ_DEPTH))));
763
764 /* disable FW if it's not supported */
765 if (!((bridge_agpstat & AGPSTAT_FW) &&
766 (vga_agpstat & AGPSTAT_FW) &&
767 (requested_mode & AGPSTAT_FW)))
768 bridge_agpstat &= ~AGPSTAT_FW;
769
770 /* Check to see if we are operating in 3.0 mode */
771 if (agp_bridge->mode & AGPSTAT_MODE_3_0)
772 agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
773 else
774 agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
775
776 pci_dev_put(device);
777 return bridge_agpstat;
778}
779EXPORT_SYMBOL(agp_collect_device_status);
780
781
782void agp_device_command(u32 bridge_agpstat, bool agp_v3)
783{
784 struct pci_dev *device = NULL;
785 int mode;
786
787 mode = bridge_agpstat & 0x7;
788 if (agp_v3)
789 mode *= 4;
790
791 for_each_pci_dev(device) {
792 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
793 if (!agp)
794 continue;
795
796 dev_info(&device->dev, "putting AGP V%d device into %dx mode\n",
797 agp_v3 ? 3 : 2, mode);
798 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, bridge_agpstat);
799 }
800}
801EXPORT_SYMBOL(agp_device_command);
802
803
804void get_agp_version(struct agp_bridge_data *bridge)
805{
806 u32 ncapid;
807
808 /* Exit early if already set by errata workarounds. */
809 if (bridge->major_version != 0)
810 return;
811
812 pci_read_config_dword(bridge->dev, bridge->capndx, &ncapid);
813 bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
814 bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
815}
816EXPORT_SYMBOL(get_agp_version);
817
818
819void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode)
820{
821 u32 bridge_agpstat, temp;
822
823 get_agp_version(agp_bridge);
824
825 dev_info(&agp_bridge->dev->dev, "AGP %d.%d bridge\n",
826 agp_bridge->major_version, agp_bridge->minor_version);
827
828 pci_read_config_dword(agp_bridge->dev,
829 agp_bridge->capndx + PCI_AGP_STATUS, &bridge_agpstat);
830
831 bridge_agpstat = agp_collect_device_status(agp_bridge, requested_mode, bridge_agpstat);
832 if (bridge_agpstat == 0)
833 /* Something bad happened. FIXME: Return error code? */
834 return;
835
836 bridge_agpstat |= AGPSTAT_AGP_ENABLE;
837
838 /* Do AGP version specific frobbing. */
839 if (bridge->major_version >= 3) {
840 if (bridge->mode & AGPSTAT_MODE_3_0) {
841 /* If we have 3.5, we can do the isoch stuff. */
842 if (bridge->minor_version >= 5)
843 agp_3_5_enable(bridge);
844 agp_device_command(bridge_agpstat, true);
845 return;
846 } else {
847 /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
848 bridge_agpstat &= ~(7<<10) ;
849 pci_read_config_dword(bridge->dev,
850 bridge->capndx+AGPCTRL, &temp);
851 temp |= (1<<9);
852 pci_write_config_dword(bridge->dev,
853 bridge->capndx+AGPCTRL, temp);
854
855 dev_info(&bridge->dev->dev, "bridge is in legacy mode, falling back to 2.x\n");
856 }
857 }
858
859 /* AGP v<3 */
860 agp_device_command(bridge_agpstat, false);
861}
862EXPORT_SYMBOL(agp_generic_enable);
863
864
865int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
866{
867 char *table;
868 char *table_end;
869 int size;
870 int page_order;
871 int num_entries;
872 int i;
873 void *temp;
874 struct page *page;
875
876 /* The generic routines can't handle 2 level gatt's */
877 if (bridge->driver->size_type == LVL2_APER_SIZE)
878 return -EINVAL;
879
880 table = NULL;
881 i = bridge->aperture_size_idx;
882 temp = bridge->current_size;
883 size = page_order = num_entries = 0;
884
885 if (bridge->driver->size_type != FIXED_APER_SIZE) {
886 do {
887 switch (bridge->driver->size_type) {
888 case U8_APER_SIZE:
889 size = A_SIZE_8(temp)->size;
890 page_order =
891 A_SIZE_8(temp)->page_order;
892 num_entries =
893 A_SIZE_8(temp)->num_entries;
894 break;
895 case U16_APER_SIZE:
896 size = A_SIZE_16(temp)->size;
897 page_order = A_SIZE_16(temp)->page_order;
898 num_entries = A_SIZE_16(temp)->num_entries;
899 break;
900 case U32_APER_SIZE:
901 size = A_SIZE_32(temp)->size;
902 page_order = A_SIZE_32(temp)->page_order;
903 num_entries = A_SIZE_32(temp)->num_entries;
904 break;
905 /* This case will never really happen. */
906 case FIXED_APER_SIZE:
907 case LVL2_APER_SIZE:
908 default:
909 size = page_order = num_entries = 0;
910 break;
911 }
912
913 table = alloc_gatt_pages(page_order);
914
915 if (table == NULL) {
916 i++;
917 switch (bridge->driver->size_type) {
918 case U8_APER_SIZE:
919 bridge->current_size = A_IDX8(bridge);
920 break;
921 case U16_APER_SIZE:
922 bridge->current_size = A_IDX16(bridge);
923 break;
924 case U32_APER_SIZE:
925 bridge->current_size = A_IDX32(bridge);
926 break;
927 /* These cases will never really happen. */
928 case FIXED_APER_SIZE:
929 case LVL2_APER_SIZE:
930 default:
931 break;
932 }
933 temp = bridge->current_size;
934 } else {
935 bridge->aperture_size_idx = i;
936 }
937 } while (!table && (i < bridge->driver->num_aperture_sizes));
938 } else {
939 size = ((struct aper_size_info_fixed *) temp)->size;
940 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
941 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
942 table = alloc_gatt_pages(page_order);
943 }
944
945 if (table == NULL)
946 return -ENOMEM;
947
948 table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
949
950 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
951 SetPageReserved(page);
952
953 bridge->gatt_table_real = (u32 *) table;
954 agp_gatt_table = (void *)table;
955
956 bridge->driver->cache_flush();
957#ifdef CONFIG_X86
958 if (set_memory_uc((unsigned long)table, 1 << page_order))
959 printk(KERN_WARNING "Could not set GATT table memory to UC!\n");
960
961 bridge->gatt_table = (u32 __iomem *)table;
962#else
963 bridge->gatt_table = ioremap_nocache(virt_to_phys(table),
964 (PAGE_SIZE * (1 << page_order)));
965 bridge->driver->cache_flush();
966#endif
967
968 if (bridge->gatt_table == NULL) {
969 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
970 ClearPageReserved(page);
971
972 free_gatt_pages(table, page_order);
973
974 return -ENOMEM;
975 }
976 bridge->gatt_bus_addr = virt_to_phys(bridge->gatt_table_real);
977
978 /* AK: bogus, should encode addresses > 4GB */
979 for (i = 0; i < num_entries; i++) {
980 writel(bridge->scratch_page, bridge->gatt_table+i);
981 readl(bridge->gatt_table+i); /* PCI Posting. */
982 }
983
984 return 0;
985}
986EXPORT_SYMBOL(agp_generic_create_gatt_table);
987
988int agp_generic_free_gatt_table(struct agp_bridge_data *bridge)
989{
990 int page_order;
991 char *table, *table_end;
992 void *temp;
993 struct page *page;
994
995 temp = bridge->current_size;
996
997 switch (bridge->driver->size_type) {
998 case U8_APER_SIZE:
999 page_order = A_SIZE_8(temp)->page_order;
1000 break;
1001 case U16_APER_SIZE:
1002 page_order = A_SIZE_16(temp)->page_order;
1003 break;
1004 case U32_APER_SIZE:
1005 page_order = A_SIZE_32(temp)->page_order;
1006 break;
1007 case FIXED_APER_SIZE:
1008 page_order = A_SIZE_FIX(temp)->page_order;
1009 break;
1010 case LVL2_APER_SIZE:
1011 /* The generic routines can't deal with 2 level gatt's */
1012 return -EINVAL;
1013 default:
1014 page_order = 0;
1015 break;
1016 }
1017
1018 /* Do not worry about freeing memory, because if this is
1019 * called, then all agp memory is deallocated and removed
1020 * from the table. */
1021
1022#ifdef CONFIG_X86
1023 set_memory_wb((unsigned long)bridge->gatt_table, 1 << page_order);
1024#else
1025 iounmap(bridge->gatt_table);
1026#endif
1027 table = (char *) bridge->gatt_table_real;
1028 table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
1029
1030 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
1031 ClearPageReserved(page);
1032
1033 free_gatt_pages(bridge->gatt_table_real, page_order);
1034
1035 agp_gatt_table = NULL;
1036 bridge->gatt_table = NULL;
1037 bridge->gatt_table_real = NULL;
1038 bridge->gatt_bus_addr = 0;
1039
1040 return 0;
1041}
1042EXPORT_SYMBOL(agp_generic_free_gatt_table);
1043
1044
1045int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
1046{
1047 int num_entries;
1048 size_t i;
1049 off_t j;
1050 void *temp;
1051 struct agp_bridge_data *bridge;
1052 int mask_type;
1053
1054 bridge = mem->bridge;
1055 if (!bridge)
1056 return -EINVAL;
1057
1058 if (mem->page_count == 0)
1059 return 0;
1060
1061 temp = bridge->current_size;
1062
1063 switch (bridge->driver->size_type) {
1064 case U8_APER_SIZE:
1065 num_entries = A_SIZE_8(temp)->num_entries;
1066 break;
1067 case U16_APER_SIZE:
1068 num_entries = A_SIZE_16(temp)->num_entries;
1069 break;
1070 case U32_APER_SIZE:
1071 num_entries = A_SIZE_32(temp)->num_entries;
1072 break;
1073 case FIXED_APER_SIZE:
1074 num_entries = A_SIZE_FIX(temp)->num_entries;
1075 break;
1076 case LVL2_APER_SIZE:
1077 /* The generic routines can't deal with 2 level gatt's */
1078 return -EINVAL;
1079 default:
1080 num_entries = 0;
1081 break;
1082 }
1083
1084 num_entries -= agp_memory_reserved/PAGE_SIZE;
1085 if (num_entries < 0) num_entries = 0;
1086
1087 if (type != mem->type)
1088 return -EINVAL;
1089
1090 mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1091 if (mask_type != 0) {
1092 /* The generic routines know nothing of memory types */
1093 return -EINVAL;
1094 }
1095
1096 if (((pg_start + mem->page_count) > num_entries) ||
1097 ((pg_start + mem->page_count) < pg_start))
1098 return -EINVAL;
1099
1100 j = pg_start;
1101
1102 while (j < (pg_start + mem->page_count)) {
1103 if (!PGE_EMPTY(bridge, readl(bridge->gatt_table+j)))
1104 return -EBUSY;
1105 j++;
1106 }
1107
1108 if (!mem->is_flushed) {
1109 bridge->driver->cache_flush();
1110 mem->is_flushed = true;
1111 }
1112
1113 for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
1114 writel(bridge->driver->mask_memory(bridge,
1115 page_to_phys(mem->pages[i]),
1116 mask_type),
1117 bridge->gatt_table+j);
1118 }
1119 readl(bridge->gatt_table+j-1); /* PCI Posting. */
1120
1121 bridge->driver->tlb_flush(mem);
1122 return 0;
1123}
1124EXPORT_SYMBOL(agp_generic_insert_memory);
1125
1126
1127int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
1128{
1129 size_t i;
1130 struct agp_bridge_data *bridge;
1131 int mask_type, num_entries;
1132
1133 bridge = mem->bridge;
1134 if (!bridge)
1135 return -EINVAL;
1136
1137 if (mem->page_count == 0)
1138 return 0;
1139
1140 if (type != mem->type)
1141 return -EINVAL;
1142
1143 num_entries = agp_num_entries();
1144 if (((pg_start + mem->page_count) > num_entries) ||
1145 ((pg_start + mem->page_count) < pg_start))
1146 return -EINVAL;
1147
1148 mask_type = bridge->driver->agp_type_to_mask_type(bridge, type);
1149 if (mask_type != 0) {
1150 /* The generic routines know nothing of memory types */
1151 return -EINVAL;
1152 }
1153
1154 /* AK: bogus, should encode addresses > 4GB */
1155 for (i = pg_start; i < (mem->page_count + pg_start); i++) {
1156 writel(bridge->scratch_page, bridge->gatt_table+i);
1157 }
1158 readl(bridge->gatt_table+i-1); /* PCI Posting. */
1159
1160 bridge->driver->tlb_flush(mem);
1161 return 0;
1162}
1163EXPORT_SYMBOL(agp_generic_remove_memory);
1164
1165struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
1166{
1167 return NULL;
1168}
1169EXPORT_SYMBOL(agp_generic_alloc_by_type);
1170
1171void agp_generic_free_by_type(struct agp_memory *curr)
1172{
1173 agp_free_page_array(curr);
1174 agp_free_key(curr->key);
1175 kfree(curr);
1176}
1177EXPORT_SYMBOL(agp_generic_free_by_type);
1178
1179struct agp_memory *agp_generic_alloc_user(size_t page_count, int type)
1180{
1181 struct agp_memory *new;
1182 int i;
1183 int pages;
1184
1185 pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
1186 new = agp_create_user_memory(page_count);
1187 if (new == NULL)
1188 return NULL;
1189
1190 for (i = 0; i < page_count; i++)
1191 new->pages[i] = NULL;
1192 new->page_count = 0;
1193 new->type = type;
1194 new->num_scratch_pages = pages;
1195
1196 return new;
1197}
1198EXPORT_SYMBOL(agp_generic_alloc_user);
1199
1200/*
1201 * Basic Page Allocation Routines -
1202 * These routines handle page allocation and by default they reserve the allocated
1203 * memory. They also handle incrementing the current_memory_agp value, Which is checked
1204 * against a maximum value.
1205 */
1206
1207int agp_generic_alloc_pages(struct agp_bridge_data *bridge, struct agp_memory *mem, size_t num_pages)
1208{
1209 struct page * page;
1210 int i, ret = -ENOMEM;
1211
1212 for (i = 0; i < num_pages; i++) {
1213 page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1214 /* agp_free_memory() needs gart address */
1215 if (page == NULL)
1216 goto out;
1217
1218#ifndef CONFIG_X86
1219 map_page_into_agp(page);
1220#endif
1221 get_page(page);
1222 atomic_inc(&agp_bridge->current_memory_agp);
1223
1224 mem->pages[i] = page;
1225 mem->page_count++;
1226 }
1227
1228#ifdef CONFIG_X86
1229 set_pages_array_uc(mem->pages, num_pages);
1230#endif
1231 ret = 0;
1232out:
1233 return ret;
1234}
1235EXPORT_SYMBOL(agp_generic_alloc_pages);
1236
1237struct page *agp_generic_alloc_page(struct agp_bridge_data *bridge)
1238{
1239 struct page * page;
1240
1241 page = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1242 if (page == NULL)
1243 return NULL;
1244
1245 map_page_into_agp(page);
1246
1247 get_page(page);
1248 atomic_inc(&agp_bridge->current_memory_agp);
1249 return page;
1250}
1251EXPORT_SYMBOL(agp_generic_alloc_page);
1252
1253void agp_generic_destroy_pages(struct agp_memory *mem)
1254{
1255 int i;
1256 struct page *page;
1257
1258 if (!mem)
1259 return;
1260
1261#ifdef CONFIG_X86
1262 set_pages_array_wb(mem->pages, mem->page_count);
1263#endif
1264
1265 for (i = 0; i < mem->page_count; i++) {
1266 page = mem->pages[i];
1267
1268#ifndef CONFIG_X86
1269 unmap_page_from_agp(page);
1270#endif
1271 put_page(page);
1272 __free_page(page);
1273 atomic_dec(&agp_bridge->current_memory_agp);
1274 mem->pages[i] = NULL;
1275 }
1276}
1277EXPORT_SYMBOL(agp_generic_destroy_pages);
1278
1279void agp_generic_destroy_page(struct page *page, int flags)
1280{
1281 if (page == NULL)
1282 return;
1283
1284 if (flags & AGP_PAGE_DESTROY_UNMAP)
1285 unmap_page_from_agp(page);
1286
1287 if (flags & AGP_PAGE_DESTROY_FREE) {
1288 put_page(page);
1289 __free_page(page);
1290 atomic_dec(&agp_bridge->current_memory_agp);
1291 }
1292}
1293EXPORT_SYMBOL(agp_generic_destroy_page);
1294
1295/* End Basic Page Allocation Routines */
1296
1297
1298/**
1299 * agp_enable - initialise the agp point-to-point connection.
1300 *
1301 * @mode: agp mode register value to configure with.
1302 */
1303void agp_enable(struct agp_bridge_data *bridge, u32 mode)
1304{
1305 if (!bridge)
1306 return;
1307 bridge->driver->agp_enable(bridge, mode);
1308}
1309EXPORT_SYMBOL(agp_enable);
1310
1311/* When we remove the global variable agp_bridge from all drivers
1312 * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1313 */
1314
1315struct agp_bridge_data *agp_generic_find_bridge(struct pci_dev *pdev)
1316{
1317 if (list_empty(&agp_bridges))
1318 return NULL;
1319
1320 return agp_bridge;
1321}
1322
1323static void ipi_handler(void *null)
1324{
1325 flush_agp_cache();
1326}
1327
1328void global_cache_flush(void)
1329{
1330 if (on_each_cpu(ipi_handler, NULL, 1) != 0)
1331 panic(PFX "timed out waiting for the other CPUs!\n");
1332}
1333EXPORT_SYMBOL(global_cache_flush);
1334
1335unsigned long agp_generic_mask_memory(struct agp_bridge_data *bridge,
1336 dma_addr_t addr, int type)
1337{
1338 /* memory type is ignored in the generic routine */
1339 if (bridge->driver->masks)
1340 return addr | bridge->driver->masks[0].mask;
1341 else
1342 return addr;
1343}
1344EXPORT_SYMBOL(agp_generic_mask_memory);
1345
1346int agp_generic_type_to_mask_type(struct agp_bridge_data *bridge,
1347 int type)
1348{
1349 if (type >= AGP_USER_TYPES)
1350 return 0;
1351 return type;
1352}
1353EXPORT_SYMBOL(agp_generic_type_to_mask_type);
1354
1355/*
1356 * These functions are implemented according to the AGPv3 spec,
1357 * which covers implementation details that had previously been
1358 * left open.
1359 */
1360
1361int agp3_generic_fetch_size(void)
1362{
1363 u16 temp_size;
1364 int i;
1365 struct aper_size_info_16 *values;
1366
1367 pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1368 values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1369
1370 for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1371 if (temp_size == values[i].size_value) {
1372 agp_bridge->previous_size =
1373 agp_bridge->current_size = (void *) (values + i);
1374
1375 agp_bridge->aperture_size_idx = i;
1376 return values[i].size;
1377 }
1378 }
1379 return 0;
1380}
1381EXPORT_SYMBOL(agp3_generic_fetch_size);
1382
1383void agp3_generic_tlbflush(struct agp_memory *mem)
1384{
1385 u32 ctrl;
1386 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1387 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1388 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1389}
1390EXPORT_SYMBOL(agp3_generic_tlbflush);
1391
1392int agp3_generic_configure(void)
1393{
1394 u32 temp;
1395 struct aper_size_info_16 *current_size;
1396
1397 current_size = A_SIZE_16(agp_bridge->current_size);
1398
1399 pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
1400 agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
1401
1402 /* set aperture size */
1403 pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1404 /* set gart pointer */
1405 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1406 /* enable aperture and GTLB */
1407 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1408 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1409 return 0;
1410}
1411EXPORT_SYMBOL(agp3_generic_configure);
1412
1413void agp3_generic_cleanup(void)
1414{
1415 u32 ctrl;
1416 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1417 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1418}
1419EXPORT_SYMBOL(agp3_generic_cleanup);
1420
1421const struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1422{
1423 {4096, 1048576, 10,0x000},
1424 {2048, 524288, 9, 0x800},
1425 {1024, 262144, 8, 0xc00},
1426 { 512, 131072, 7, 0xe00},
1427 { 256, 65536, 6, 0xf00},
1428 { 128, 32768, 5, 0xf20},
1429 { 64, 16384, 4, 0xf30},
1430 { 32, 8192, 3, 0xf38},
1431 { 16, 4096, 2, 0xf3c},
1432 { 8, 2048, 1, 0xf3e},
1433 { 4, 1024, 0, 0xf3f}
1434};
1435EXPORT_SYMBOL(agp3_generic_sizes);
1436